今天學習使用了HttpClient4.2向服務端傳送上傳檔案的post請求，由於伺服器端採用MultipartFile形式接收，查詢資料後決定使用HttpClient4.2實現，以下是實現程式碼（僅作測試使用）：

   public void testtaskPost()throws  Exception{
        HttpClient httpclient = new DefaultHttpClient();
        try {
            //新建一個httpclient Post 請求
            HttpPost httppost = new 
            HttpPost("http://127.0.0.1:8889/taskmanagement/task"
 
);
            //由於只是測試使用 這裡的路徑對應本地檔案的物理路徑
            FileBody bin = new FileBody(new File("E://2017//1.doc"));
            File myfile = new File("E://2017//1.doc");
            long size  = myfile.length();
            //向MultipartEntity新增必要的資料
            StringBody comment = new StringBody("1.doc", 
            Charset.forName
 
("UTF-8"));
            MultipartEntity reqEntity = new MultipartEntity();
            reqEntity.addPart("file",bin);//file為請求後臺的Fileupload引數
            reqEntity.addPart("filename",comment);//請求後臺Fileupload的引數
            httppost.setEntity(reqEntity);
            //這裡是後臺接收檔案的介面需要的引數，根據介面文件需要放在http請求的請求頭
            String taskid ="919894d9-ea5a-4f6a-8edd-b14ef3b6f104"
 
;
            httppost.setHeader("task-id",taskid);
            String fileid = UUID.randomUUID().toString();
            httppost.setHeader("file-id",fileid);
            httppost.setHeader("file-name","1.doc");
            httppost.setHeader("file-size",String.valueOf(size));
            httppost.setHeader("total", String.valueOf(1));
            httppost.setHeader("index",String.valueOf(1));

            HttpResponse response = httpclient.execute(httppost);
            int statusCode = response.getStatusLine().getStatusCode();
            if(statusCode == HttpStatus.SC_OK){
                System.out.println("伺服器正常響應.....");
                HttpEntity resEntity = response.getEntity();
                System.out.println(
                //httpclient自帶的工具類讀取返回資料
                EntityUtils.toString(resEntity));
                System.out.println( resEntity.getContent());
                EntityUtils.consume( resEntity);
            }
        } catch (ParseException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                httpclient.getConnectionManager().shutdown();
            } catch (Exception ignore) {
            }
        }
    }